Gardening Tips for September for Redwood City, CA


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Southwest Region

  • Fertilize your lawn. Lawns fertilized in the fall are better equipped to survive the winter. Reseed in bare patches.
  • Begin cutting back on watering of the garden and lawn (except newly seeded areas) so that plants can prepare for dormancy (not growth).
  • Save the seeds from your self-pollinating flowers, such as marigolds, cosmos, or coneflowers, to plant next spring by drying them and storing them in closed containers.
  • Plant spring wildflowers now.
  • If you purchased spring-blooming bulbs, plant them as soon as you get them.
  • In some areas, you can plant cool-season vegetables, such as cabbage, broccoli, carrots, garlic, Swiss chard, lettuce, beets, kale, parsnips, radishes, peas, spinach, turnips, and celery. See our seed-starting chart on
  • Plant cool-season annuals, such as pansies and snapdragons, when the temperature begins to decrease.
  • Plant any perennials. Divide and replant overcrowded perennial beds. Remember to apply a layer of organic matter to the new bed.
  • Use only phosphate fertilizers on perennials and bulbs (no nitrogen).
  • Do not fertilize annuals.
  • Cut back annuals when they finish flowering.
  • Plan to seed cool-season lawns, such as bluegrass or ryegrass, towards the end of the month; fall is the best time to establish such lawns.
  • Place tropical houseplants under shade trees to prepare them for winter indoors.
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